Using a powerful Detector Control System (DCS) is one of the most important requirements in big high-energy physics experiments like CMS. After an introduction of the organization of the CMS detector and of the concept and the architecture of DCS, the paper will concentrate on the description of the Link Board, a data and trigger link readout module of the CMS RPC (Resistive Plate Chamber detector), and the possibility of using a 'Control board' (ELMB or CCUM) to control it.
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